<template>
  <div>
    <!-- 面包屑列表区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
     <el-row>
       <el-col>
         <el-button type="primary">添加角色</el-button>
       </el-col>
     </el-row>

     <!-- 列表区 -->
      <el-table :data="roleList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', i1===0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <el-row :class="[i2===0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                  <!-- 渲染二级权限 -->
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">
                      {{item2.authName}}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 渲染三级权限 -->
                  <el-col :span="18">
                    <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id"
                    closable @close="removeRightById(scope.row, item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>
              {{scope.row}}
            </pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" @click="showsetRightDialog(scope.row)">
              分配权限
            </el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
  title="分配权限"
  :visible.sync="setRightDialogVisible"
  width="50%" @close=" setRightDialogClose">
  <!-- 树型控件 -->
  <el-tree ref="treeRef" :data="rightsList" :props="treeProps" show-checkbox node-key="id" 
  default-expand-all :default-checked-keys="defKeys">
  </el-tree>
  <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="allotRights">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      roleList: [],
      // 分配权限对话框的展示与否
      setRightDialogVisible: false,
      // 获取分配权限数据
      rightsList: [],
      // 树形空间的属性绑定
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      // 默认选中的三级权限的id   保存到数组中
      defKeys: [],
      // 弹出分配权限的对话框时把当前角色的id保存下来
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.roleList = res.data
      // console.log(this.roleList)
    },
    // 根据id 删除权限
    async removeRightById(role, rightID) {
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightID}`)
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      // 返回的data, 是当前角色下最新的权限数据
      role.children = res.data
    },
    async showsetRightDialog (role) {
      // 保存当前角色的id 到data中
      this.roleId = role.id

      const { data: res } = await this.$http.get('rights/tree')
      // console.log(res)
      
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
      }
      
      this.rightsList = res.data
      // 权限对话框弹出之前调用  默认选中三级权限的数组函数
      this.getLeafKeys(role, this.defKeys) 
      
      this.setRightDialogVisible = true
    },
    // 默认选中三级权限的数组函数
    getLeafKeys(node, arr) {
      // 如果是三级权限节点，则没有了children属性
      if (!node.children) {
        return arr.push(node.id)
      }
      // 如果不是三级权限节点，则继续使用递归方式查找
      node.children.forEach(item => this.getLeafKeys(item, arr)
        
      )
    },
    setRightDialogClose () {
      this.rightsList = []
    },
    // 点击确定按钮为角色分配权限
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // console.log(keys)
      const idStr = keys.join(',')
      // 向服务器发起请求
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, {
        rids: idStr
      })

      if (res.meta.status !== 200) return this.$message.error('分配权限失败')

      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style>
  .el-tag{
   margin: 7px;
  }

  .bdtop {
   border-top: 1px solid #eee
  }

  .bdbottom {
   border-bottom: 1px solid #eee
  } 

  .vcenter {
    display: flex;
    align-items: center;
  }

</style>
